Smartphones. Social networks. Problematic smartphone use. Problematic use of mobile phones. Smartphone addiction. Fear of missiong out. COVID-19.

Research objective: Increasing interest in new technological advances, in this case smartphones, brings about an increasing scale of their usage, which in many cases exceeds the boundaries of common use and becomes problematic. The period of restrictions caused by COVID-19 is a variable causing an increase of social media usage across age groups. Based on a theoretical analysis, we have defined the main objective of a questionnaire study, which is to measure the way and size of problematic usage of smartphones among female university undergraduates, including the attributes of phobic and addictive usage. In order to cover the matter in a wider context, another objective of this study emerged, which was to explore the connection between the size and method of smartphone use and some other concepts, such as the fear of missing out and satisfaction with life. The third objective we introduced was a regression model of observed variables with problematic smartphone use behaviour as a dependant variable.